I visited this air museum out by the Oregon coast, that is housed in an old blimp hangar. Pretty neat place.
They had a pair of these little prototype single man helicopters. One had an FAA experimental number on it(?)
One of those experimental helicopters, which was obviously hand built by the looks of it, was found in a blackberry patch near Portland.
I took lots of pictures of those.
They’re the true embodiment of leading edge experimental engineering.